Fully-immersed battery pack

Abstract

The utility model relates to the technical field of battery packs, and provides a full-immersion battery pack, which comprises a box body, a box cover, an upper bulge and an explosion-proof valve, and is characterized in that the box body is used for storing battery cells and immersion liquid; the box cover is arranged on the top of the box body, the upper protrusion is arranged on the top of the box cover, and a liquid storage cavity communicated with the box cover is formed in the upper protrusion. According to the battery pack, the stepped design is adopted, the upper protrusion is further arranged at the top of the box cover, the box body and the box cover can be filled with immersion liquid, part of the immersion liquid is immersed into the liquid storage cavity, and the situation that when thermal runaway occurs, the immersion liquid blocks the anti-explosion valve can be prevented through the design that the cavity is arranged at a certain distance; according to the battery pack provided by the invention, the upper bulge is arranged to additionally increase the storage space of the immersion liquid, so that the immersion liquid can completely immerse the battery cell, the heat dissipation effect on the battery cell is improved, more time and space are provided for gas diffusion, and the safety of the battery pack during heat management is improved.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and in particular to a fully submersible battery pack. Background Technology

[0002] Currently, energy storage systems are becoming increasingly large-scale, and control strategies are becoming more complex. Among these strategies, safety control is crucial, as the health status of each energy storage unit significantly impacts the entire system. As the density of battery arrangement within energy storage containers increases, the large amount of heat generated by the batteries becomes difficult to dissipate quickly, leading to heat accumulation between batteries and between battery packs. This results in significant temperature differences and variations within the batteries, which, under long-term operational requirements, will greatly affect the efficiency, safety performance, and cycle life of the energy storage system. Therefore, temperature and humidity control, as well as thermal management, are necessary for containerized energy storage equipment to ensure that the batteries in the energy storage system operate within their optimal temperature range.

[0003] Currently, there is a solution that combines immersion management and fire protection. This solution involves immersing the battery pack in liquid, which dissipates heat from the battery cells within the pack, thus addressing the issue of thermal runaway.

[0004] Utility model CN217955965U discloses a submersible battery pack, including a battery box and batteries. The battery box contains a heat exchange medium, and the batteries are disposed within the battery box and at least partially submerged in the heat exchange medium. Each battery includes an explosion-proof valve, and a non-submerged area is located at the explosion-proof valve; this non-submerged area is not submerged by the heat exchange medium. However, the immersion liquid in the aforementioned submersible battery pack cannot completely submerge the battery cells. To prevent the immersion liquid from clogging the explosion-proof valve, the height of the immersion liquid inside the battery pack is limited, and the immersion liquid cannot adequately dissipate heat from the battery cells. Therefore, this solution proposes a fully submersible battery pack to address the aforementioned problems. Utility Model Content

[0005] In view of this, the present invention proposes a fully submerged battery pack to solve the technical problem that in order to prevent the submerged liquid from clogging the explosion-proof valve, the height of the submerged liquid inside the battery pack is limited, and the submerged liquid cannot fully achieve the heat dissipation effect on the battery cells.

[0006] The technical solution of this utility model is achieved as follows: This utility model provides a fully submersible battery pack, including a housing, a cover, an upper protrusion, and an explosion-proof valve, wherein...

[0007] The enclosure is used to store the battery cells and immersion liquid;

[0008] A lid is provided on the top of the box body, and an upper protrusion is provided on the top of the lid. A liquid storage cavity communicating with the lid is formed inside the upper protrusion.

[0009] An explosion-proof valve is located on the top of the upper protrusion and is used to seal the liquid storage chamber.

[0010] Based on the above technical solutions, preferably, the upper protrusion is located at the center of the housing.

[0011] Based on the above technical solutions, preferably, the liquid storage chamber includes a lower liquid immersion chamber and an upper cavity located above the lower liquid immersion chamber, wherein the lower liquid immersion chamber is used to store the immersion liquid.

[0012] Based on the above technical solutions, preferably, the bottom of the box cover is provided with a liquid immersion chamber that communicates with the box body, and the lower liquid immersion chamber is connected to the liquid immersion chamber.

[0013] Based on the above technical solutions, preferably, the height of the lower liquid immersion chamber is H1, and the height of the upper cavity is H2, where 1 / 5 ≤ H2 / H1 ≤ 3 / 5.

[0014] Based on the above technical solutions, the preferred option is H2 / H1 = 2 / 5.

[0015] Based on the above technical solutions, the preferred configuration is H1 = 50mm and H2 = 20mm.

[0016] Based on the above technical solutions, preferably, it also includes an injection port and an outlet, wherein,

[0017] Both the injection port and the outlet port are connected to the tank cover for the flow of immersion liquid.

[0018] Based on the above technical solutions, preferably, both the injection port and the outlet port are connected to one side of the tank cover.

[0019] Based on the above technical solutions, a preferred embodiment also includes a base, wherein...

[0020] A base is disposed below the housing to support the housing, and the sidewall of the base extends out of the housing.

[0021] The fully submersible battery pack of this invention has the following advantages over the prior art:

[0022] (1) The battery pack of this application adopts a stepped design. By providing an upper protrusion on the top of the cover, the immersion liquid can fill the box body and cover and partially immerse itself in the liquid storage chamber. By setting the liquid storage chamber to be only partially immersed in the immersion liquid, a certain distance cavity still exists between the explosion-proof valve and the immersion liquid. The design of a certain distance cavity can prevent the immersion liquid from blocking the explosion-proof valve in the event of thermal runaway, ensuring the safe pressure relief of the battery pack under abnormal conditions. By setting the upper protrusion to additionally increase the storage space of the immersion liquid, the immersion liquid can completely immerse the battery cells, increasing the heat dissipation effect of the battery cells, and at the same time providing more time and space for gas diffusion, increasing the safety of the battery pack of this application during thermal management.

[0023] (2) By setting the upper protrusion at the center of the box, the gas that has thermal runaway can migrate a longer distance when the upper protrusion is centrally managing the gas discharge, increasing the time for absorption by the immersion liquid and achieving a better cooling effect. The stepped design helps to reduce gas accumulation by changing the gas flow path and increasing the space. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a perspective view of the fully submersible battery pack of this utility model;

[0026] Figure 2 This is a top view of the fully submersible battery pack of this utility model;

[0027] Figure 3 This is a front view of the fully submersible battery pack of this utility model;

[0028] Figure 4 This invention relates to a fully submersible battery pack. Figure 3 Cross-sectional view of the structure at point AA shown;

[0029] Figure 5 This invention relates to a fully submersible battery pack. Figure 4 A magnified view of point B shown.

[0030] In the diagram: 1. Box body; 2. Box cover; 21. Liquid immersion chamber; 3. Upper protrusion; 31. Liquid storage chamber; 311. Lower liquid immersion chamber; 312. Upper cavity; 4. Explosion-proof valve; 51. Liquid injection port; 52. Liquid outlet; 6. Base; 10. Battery cell. Detailed Implementation

[0031] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0032] like Figures 1-5 As shown, the fully submerged battery pack of this utility model includes a housing 1, a cover 2, an upper protrusion 3, and an explosion-proof valve 4. The housing 1 is used to store the battery cells 10 and the immersion liquid. The cover 2 is located on the top of the housing 1, and the upper protrusion 3 is located on the top of the cover 2. The upper protrusion 3 has a liquid storage cavity 31 that communicates with the cover 2. The explosion-proof valve 4 is located on the top of the upper protrusion 3 and is used to seal the liquid storage cavity 31.

[0033] In specific implementation, an upper protrusion 3 is provided on the top of the cover 2, allowing the immersion liquid to fill the box body 1 and the cover 2 and partially immerse itself in the liquid storage chamber 31. By setting the liquid storage chamber 31 to be only partially immersed in the immersion liquid, a certain distance cavity remains between the explosion-proof valve 4 and the immersion liquid. This certain distance cavity design prevents the immersion liquid from blocking the explosion-proof valve 4 in the event of thermal runaway, ensuring the safe depressurization of the battery pack under abnormal conditions. The upper protrusion 3 additionally increases the storage space for the immersion liquid, allowing the immersion liquid to completely immerse the battery cell 10, increasing the heat dissipation effect on the battery cell 10, and also providing more time and space for gas diffusion, thus increasing the safety of the battery pack in this application during thermal management.

[0034] In a specific implementation, the liquid storage chamber 31 includes a lower liquid immersion chamber 311 and an upper cavity 312 located above the lower liquid immersion chamber 311. The lower liquid immersion chamber 311 is used to store the immersion liquid.

[0035] The upper protrusion 3 is located at the center of the housing 1.

[0036] By placing the upper protrusion 3 at the center of the housing 1, the thermally runaway gas can migrate a longer distance when the upper protrusion 3 centrally manages the gas discharge, increasing the time for absorption by the immersion liquid and achieving a better cooling effect. The stepped design helps to reduce gas accumulation by changing the gas flow path and increasing the space.

[0037] The bottom of the cover 2 is provided with a liquid immersion chamber 21 that communicates with the body 1, and the lower liquid immersion chamber 311 communicates with the liquid immersion chamber 21.

[0038] This design allows for a larger storage space between the cover 2 and the body 1 for the immersion liquid to completely submerge the battery cell 10.

[0039] like Figures 3-5 As shown, in a preferred embodiment, the height of the lower liquid immersion chamber 311 is H1, and the height of the upper cavity 312 is H2, where H1 = 50 mm and H2 = 20 mm.

[0040] This design allows the upper cavity 312 to contain steam, preventing excessive pressure during vaporization from causing the explosion-proof valve 4 to misactivate or become blocked. Setting H1 to 50mm ensures sufficient immersion fluid to cover the battery, effectively managing heat and improving cooling efficiency. Setting H2 to 20mm provides ample space to buffer gases generated during boiling or vaporization, thus improving overall thermal management performance.

[0041] like Figures 1-2 As shown, in a preferred embodiment, it also includes an injection port 51 and an outlet port 52, wherein the injection port 51 and the outlet port 52 are both connected to the tank cover 2 for supplying the immersion liquid.

[0042] Both the injection port 51 and the outlet port 52 are connected to one side of the box cover 2.

[0043] By setting both the liquid injection port 51 and the liquid outlet 52 to be connected to one side of the cover 2, it is convenient to handle the inflow and outflow of immersion liquid after the battery pack is assembled.

[0044] like Figure 1 As shown, in a preferred embodiment, it also includes a base 6, wherein the base 6 is disposed below the housing 1 for supporting the housing 1, and the side wall of the base 6 extends out of the housing 1.

[0045] This design is intended to increase the stability of the battery pack used in this application.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fully-immersed battery pack, characterized by: Includes a housing (1), a lid (2), an upper protrusion (3), and an explosion-proof valve (4), wherein, The housing (1) is used to store the battery cell (10) and the immersion liquid; A lid (2) is provided on the top of the box body (1), and an upper protrusion (3) is provided on the top of the lid (2). The upper protrusion (3) has a liquid storage cavity (31) that communicates with the lid (2). An explosion-proof valve (4) is disposed on the top of the upper protrusion (3) for sealing the liquid storage chamber (31).

2. The fully-submerged battery pack of claim 1, wherein: The upper protrusion (3) is located at the center of the housing (1).

3. The fully-submerged battery pack of claim 1, wherein: The liquid storage chamber (31) includes a lower liquid immersion chamber (311) and an upper cavity (312) located above the lower liquid immersion chamber (311). The lower liquid immersion chamber (311) is used to store immersion liquid.

4. The fully-submerged battery pack of claim 3, wherein: The bottom of the cover (2) is provided with a liquid immersion chamber (21) that communicates with the box body (1), and the lower liquid immersion chamber (311) communicates with the liquid immersion chamber (21).

5. The fully-submerged battery pack of claim 3, wherein: The height of the lower liquid immersion chamber (311) is H1, and the height of the upper cavity (312) is H2, 1 / 5≤H2 / H1≤3 / 5.

6. The fully-submerged battery pack of claim 5, wherein: H2 / H1 = 2 / 5.

7. The fully-submerged battery pack of claim 6, wherein: H1 = 50mm, H2 = 20mm.

8. The fully-submerged battery pack of claim 1, wherein: It also includes an injection port (51) and an outlet port (52), wherein, Both the injection port (51) and the outlet port (52) are connected to the tank cover (2) for the flow of immersion liquid.

9. The fully-submerged battery pack of claim 8, wherein: Both the injection port (51) and the outlet port (52) are connected to one side of the box cover (2).

10. The fully-submerged battery pack of claim 1, wherein: It also includes a base (6), in which, A base (6) is disposed below the housing (1) for supporting the housing (1), and the side wall of the base (6) extends out of the housing (1).

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